![]() Without an electrician’s guidance, you should only proceed as far as finding and opening the main breaker box. It’s a potentially risky task that should only be attempted by an expert. Regardless of how confident you are with the job, wiring a 100-amp circuit breaker box might be a difficult undertaking that requires the approval of an electrician. To power up the load circuits through Hot, Neutral, and Gerund wire, both tiny circuit breakers and GFCI circuit breakers are linked in the diagram below. As a result, the single Hotwire is linked to both hot lugs, which fed up 120V load points. To achieve just 120V supply voltage, you’ll need to use a jumper wire to connect Hot 1 (the black line) to both hot lugs in the subpanel. You will need all three wires, namely Hot 1 (Line 1 from the 1-Pole Breaker), Neutral from the Neutral busbar, and Ground from the ground terminal, as illustrated. Wiring Installation of a 100A Subpanel for Only 120V Finally, the electrician installs the feeder breaker in the main service panel’s open double slot.Ĭonsequently, separate circuit breakers for the additional circuits then become ready to be fitted in the subpanel. Next, the electrician connects the hot feeder wires to a new 240-volt circuit breaker at the main panel and then attaches the neutral and ground wires from the feeder cable to the respective bus bars in the main panel. The electrician attaches the two hot wires from the feeder cable to the lugs on the hot bus bars in the subpanel, connects the neutral wire to the neutral bus bar, and the bare copper grounding wire to the grounding bus bar. A 100-amp subpanel needs #4 copper wires or, more typically, #2 aluminum wires. A three-wire cable with three insulated conductors and a bare copper ground wire is conventional. ![]() Gently torque the screws in order for them to be connected firmly to the circuit breaker’s body.While installing a subpanel, an electrician generally first runs a feeder cable to the subpanel from the main panel. Well, they ought to be connected to the new main breaker. Depending on the model of your breaker, you may notice that there are wires dangling that need to be connected somewhere. Finishing upĪfter lodging the new breaker into place, it’s now time to finish your maintenance job up. For safety measures, I implore that you gather the help of professional electricians if you’re unsure of what you are doing. If for instance your new breaker couldn’t fit right into the socket, then you can check the opening to see if there are any obstructions within. It should snap into place easily and seamlessly. To do this, just carefully push the breaker into the open socket. With all that being said and done, now is the time to replace it with a newer breaker model. The breaker should roll out its socket effortlessly. It should come out easily and without much trouble, as breakers are commonly designed for seamless maintenance. To disconnect the main breaker, carefully pry it with a screwdriver. Carefully removing the wirings of your main circuit breaker is a tedious task hence, you should be totally focused when performing this step. This is considered to be the most crucial step in this guide. This is in order to prevent any unnecessary accidents that could damage the cover’s material integrity. To remove the said cover, you can use your regular large screwdriver to detach the screws binding the cover and the circuit box itself.Īfter removing the cover, safely store it somewhere safe. The main circuit breaker commonly comes installed with a protective covering. You can use a multimeter to make sure there’s no power. They are the only entity with access to your home’s main power feed, which supplies the electricity in your home. ![]() You can shut down the electrical line by calling your local electricity provider. Likewise, turning off the electrical line also prevents your appliances from being damaged due to a sudden electric surge. In order for you to safely work on the project, the circuitry must first be de-energized to prevent untoward electrocution and other electrical accidents from happening. Now, to safely replace the main breaker, I’ve written this short yet informational manual that should guide you in the said maintenance task. Hence, I recommend that you have these devices first on hand before proceeding to the proper steps of changing the breaker itself. Without these instruments, you may have a hard time performing a replacement. The tools I’ve listed below are vital for changing the main circuit breaker. ⅜-inch Allen wrench (to remove the breaker’s lugs & tighten socket head bolts).Large screwdriver (to remove & tighten screws).
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